Circuit maker and breaker



Jan. 2Q, 1942. v s. DETTAR. 2,270,513

CIRCUIT MAKER AND BREAKER sNvENToR with 4its` -contacts;,initially close Aprior` d poitiveclosng thereof; y

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rti 1 sectional ew imgrgfw es hownpositivelyclosed:

16:15:@ ifragglentgryseptiona to Fig. 5 showing the circuit maker and breuken with its contacts still. closed prior to rapd'positive opennghereof. A L 1 emile v15de- V itil,-

11.4', and proyidessazgmechanica1-if pumping stro-ke' piston-1B.Electricrrrentfomoita mustrJ-e supplied toifithefsolend coil'ilIT-"atfth completion of each sprgg-actuated mechanical stroke of the solenoid plungerP-ll-fad such :supy- @minimumeisen-immorale@- noidplungerll.

is accomplished by the positive acting delayed cam action quick make and break circuit maker and breaker embodying the invention which now will be described in detail.

The delayed cam man quai-.x make and breakcircuit maker and breaker embodying the in` -vention disclosed in Figs. 1 to 'I inclusive generally designated bythe numeral 25 throughout the drawings comprises a vertically disposed hollow guide member 25 preferably formed from a U-shaped stamping 21 and a rectangular stamping 28 secured together by the bolts 29 and 38. The lower portion of the rectangular stamping is bent at right angles thereto to form a seat 3| which is xed to the top` of the cover I4 of Vthe solenoid imit I2 by short stud screws 32.

The said guide member 26 has a maker push 20 to avoid electrical contact between the push arm 34 and the contact arm 56.

A cam slide member 4I having aslotted aperture 42 therein is disposed vertically in said guide member 26 and extends through the rectangular apertures 35 and 36 of each plsh arm 33.. and

34 respectively.Y The guide member 26 has a Y vertically disposed slot 43 therein through which extends the tongue 44 of a horizontally disposed L-shaped arm 45 mounted on Vthe reciprocating element or shaft I8 of the solenoid unit I2. The 40 said reciprocating element I9 is shouldered at 46 to provide a seat against which the `said arm 45 is secured by threading the nut 41 on the reduced end 48 of the said reciprocating element or shaft I8.

The said cam slide member 4I has oppositely disposed maker and breaker cams 49 and 58 respectively formed thereon which cooperate with the maker cam follower 31 and the breaker cam follower 38 respectively as indicated in Figs. 1 01? inclusive and as hereinafter described in de- The circuit maker and breaker 25 is provided with ,a bracket 5I secured to the hollow guide member 26 by the bolt 28 which serves as an abutment for the compression springs 53 and 54 which constantly urge the maker push arm 33 and breaker push arm 34 respectively toward contact arms 55 and 56 which preferably carry pairs of contactors 51 and 58 respectively. The contact arm 55 is grounded with respect tothe circuit maker and breaker 25 an'd'is securedthereto by the bolt 29 and is normally disposed parallel'and in spaced relationship to the said hollow guide member 26. Contact arm 56 is securedin insulated relationship and normally parallel to the said hollow guide member 26 by the bolt .30 and the insulators 388 and 36| disposed therearound as indicated `in Figs. -1. 4, 5 and 6. When assembled andwithout pressure being applied thereto by either the Ymaker or breaker push arms 33 and 34 respectively, the contact arms 55 and 56 normally urge Athecontactors 51 and 58 thereon into contact with re,- spect -to each other, see Figs. 4 and 6.- It will Thistimedintermittentsul, -plyofelectriccurrenttothesolenoidcoil I1 benotedthat,byhavlngoneofthecontactarms 55 or56shorterthantheother,whenthecon factors 51 andY 58 thereon are moved into and out of contactwith respect to each other, a wi iing action occurs which maintains the cont xt surface of the contactors 51 and 58, bright an" clean.

To assure smooth working of the delayed cam action circuit maker and breaker 2 5, the compression springs 53 and 54 are made proportionately as strong vas the spring pressure oftb e contact arms 55 and 55 respectively thereagains For example, in the embodiments of the inver tion disclosed iri the drawings, the compressie spring 54 is slightly stronger than the compressionpspring 53. Also, to assure retention of the springs 53' and 54 in their proper place, the bracket 5I is provided with suitable protuberances 52 which center one end of the said springt- 53 and 54, and the maker push arm 33 and the breaker push arm 34 are each provided with a tongue 338 and 348 respectively which center the other end of the said springs 53 and 54 respectively.

As diagrammatcally .illustrated in Figs. 1 and 5, electric current from a suitable source such as the battery 59 runs throughthe solenoid I1 when the contactors 51 and 5,8,.of the circuit maker andbreaker 25 are closed, one side of the battery 59 and the contactarm 55 carrying the contacter 5.1 being grounded while the other side of the battery 59 is connected through Athe solenoid lI1 to the contact arm 56 carrying the contactor 58.

Fig. 1 shows .the open position taken by the contactors 51 and 58 after the solenoid I1 has f caused the cam slide member 4| to jump in the direction of movement 68 of the electric power stroke of the solenoid plunger I8 under the power of the compression spring` 54 of the breaker push arm 34. The movement o f the breaker push arm 34 when causing the cam slide member 4I to jump opens the contactors 51 and 58 instantaneously to the position indicated'in Fig. 1. Nowl the spring actuated mechanical stroke of the solenoid plunger I8 in the direction indicated by the arrow 6I in Fig. 4 begins and continues until the slide member 4I arrives at the position indicated in Fig. 4 wherein the contactors 51 and 58 have been initially closed at which position the rapid positive closing of the said contactors 51 and 58 is accomplished by the action of the maker push arm 33 as hereinafter described in detail. The movement of the slide member 4I to the position indicated in Fig. 4 from its position indicated in Fig. l causes the cam 58 thereof to ac t on the cam follower'. 38 of the maker push arm 34 and move it back'to its neutral position shown in Fig. 4.

At the initial closing of the contactors 51 and 58 by thesprin'g actuated stroke of the solenoid plunger I8 and the reciprocatingelement or shaft I9 affixed thereto in the direction indicated by the arrow 5| in Fig. 4,4the spring loaded cam 

